Abstract
A cycloidal speed reducer employing gears with permanent magnets acting as teeth is described. The magnets, which have their axes radially oriented in both the orbiting gear and the fixed internal gear, are inserted in holes drilled in nonmagnetic rims without protruding from the cylindrical exposed surfaces. Because the orbiting gear is not restrained radially, it contacts the fixed gear and rolls on its inner surface. A normal force is developed at the contact point between the gears to balance the magnetic attraction and the centrifugal force of the orbiting gear. The friction available due to this normal force increases the transmission’s torque capacity, which is further increased by elimination of the gap between the gears. Also, the radial load on the supporting orbiting gear bearing is eliminated. A prototype with a reduction ratio of 26 is being tested.
Highlights
Speed reducers based on the magnetic transmission of forces instead of on conventional mechanical elements such as gears, chains and belts, are becoming increasingly attractive
The following advantages result: 1) the transmission’s torque capacity is increased because, in addition to the magnetic force between the gears, a frictional force associated with the normal contact force, is developed, 2) the radial load on the bearing supporting the orbiting gear is eliminated, 3) the need to accurately control the separation between the gears is eliminated, and 4) a greater magnetic attraction between magnets is obtained by elimination of the gap between them
The UNAM cycloidal magnetic speed reducer incorporates novel features which confer it advantages over the state of the art
Summary
Speed reducers based on the magnetic transmission of forces instead of on conventional mechanical elements such as gears, chains and belts, are becoming increasingly attractive. In the transmissions treated in all the previously mentioned references, the magnetic forces of attraction act across small gaps between the elements of the mechanism with no contact between them In contrast with this characteristic, the magnetic gears of the cycloidal speed reducer treated in this paper contact one another due to the fact that the orbiting gear is free to move outwardly under the action of the magnetic attraction from the fixed gear and the centrifugal force. The advantages of this concept are pointed out in the description that follows. This speed reducer is referred to as the UNAM cycloidal magnetic speed reducer
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